某热气球体积为1000m3，能载重6900N，若空气密度ρ=1.29kg/m3，则热气球受到的浮力为　_1　N，它的自重为　_2　N．（g取10N/kg）

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某热气球体积为1000m³，能载重6900N，若空气密度ρ=1.29kg/m³，则热气球受到的浮力为　 ____　N，它的自重为　 ____　N．（g取10N/kg）

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12900,6000

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